- Users: Yin and the Woo Foo Battle Cruiser (together)
- Side of Woo Foo: Mystic
- Level: Level 1, Supplementary
Transfoo-Shrinkmafy is a Woo Foo move in which Yin transfered her Transfoomate into the Woo Foo Battle Cruiser's Shrink Mode, shrinking her, the Battle Cruiser, and her brother enough to go inside of Master Yo and chase down Yuck in the episode "Voyage to the Center of the Yo". In reality, she was making it up as she did it, and was suprised when it actually worked.